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Prism-coupling systems and methods for characterizing curved parts

  • US 10,156,488 B2
  • Filed: 08/29/2013
  • Issued: 12/18/2018
  • Est. Priority Date: 08/29/2013
  • Status: Active Grant
First Claim
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1. A method for determining at least one characteristic of a curved part having a curved outer surface and a near-surface waveguide region defined by an ion-exchanged region, comprising:

  • interfacing a coupling surface of a coupling prism to the curved outer surface to define a coupling interface proximate the near-surface waveguide region;

    directing measurement light through the coupling prism and to the coupling interface and coupling a portion of the measurement light into TE and TM modes supported by the near-surface waveguide region, wherein the measurement light has a width of 3 mm or less;

    digitally capturing TE and TM mode spectra reflected from the coupling interface and defined by the TE and TM modes supported by the near-surface waveguide region; and

    processing the TE and TM mode spectra to determine the at least one characteristic of the curved part.

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